US4080606A - Ink jet printer - Google Patents

Ink jet printer Download PDF

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Publication number
US4080606A
US4080606A US05/683,277 US68327776A US4080606A US 4080606 A US4080606 A US 4080606A US 68327776 A US68327776 A US 68327776A US 4080606 A US4080606 A US 4080606A
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United States
Prior art keywords
signal
information recording
ink
annex
ink droplets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/683,277
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English (en)
Inventor
Takahiro Yamada
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Hitachi Ltd
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Hitachi Ltd
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Publication date
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Publication of US4080606A publication Critical patent/US4080606A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/115—Ink jet characterised by jet control synchronising the droplet separation and charging time

Definitions

  • This invention relates to an ink jet printer in which ink droplets appearing at intervals in place of the information recording ink droplets are electrified for a purpose other than information recording.
  • An ink jet printer is disclosed in, for example, the specification of the U.S. Pat. No. 3,596,275 granted to Richard G. Sweet on July 27, 1971.
  • the information recording signal voltage is applied to the charging electrode coupled electrostatically to the ink column. Consequently, the ink droplets are charged according to the information recording signal voltage.
  • the charged ink droplets are deflected when they pass between the deflecting electrodes and then the deflected ink droplets adhere to the recording medium to form an ink dot pattern in the desired positions of the medium.
  • phase control devices have been invented by Robert I. Keur (U.S.
  • One object of this invention is to prevent the distortion in the charging of the ink droplets for information recording, in an ink jet printer wherein ink droplets appearing at intervals in place of the recording ink droplets are electrified for a purpose other than information recording.
  • Another object of this invention is to provide an ink jet printer which can attain the above object without resort to any complicated circuit means.
  • Yet another object of this invention is to prevent the distortion in the electrification of those information recording ink droplets which are just after the ink droplets appearing at intervals in place of the information recording ink droplets and electrified according to the deflection sensitivity detecting signal or the phase detecting signal, in an ink jet printer.
  • the information recording signal, annex signals including the deflection sensitivity detecting signal and the phase detecting signal and the compensation signal provided on the basis of the annex signals as a predetermined signal for compensating distortion of the information recording signal due to the annex signals are all synthesized by an arithmetic amplifier circuit and then the resultant signal is applied to the electrode for charging ink droplets.
  • FIG. 1 shows in block diagram an embodiment of this invention.
  • FIG. 2 shows waveforms appearing at various points in the circuit shown in FIG. 1.
  • FIG. 3 is a detailed version of FIG. 1, with a part omitted.
  • FIG. 4 shows in block diagram another embodiment of this invention.
  • FIG. 5 is a detailed version of FIG. 4.
  • the pressured ink 4 is jetted out of a nozzle 1 through its small opening.
  • the nozzle 1 is fitted in an electro-mechanical transducer 3 which is vibrated by the HF voltage applied from a HF power source 2 through an amplifier 18.
  • the ink jetted out of the nozzle 1 forms an ink column 5 near the tip of the nozzle 1 and the ink column 5 is regularly split into ink droplets 6 by the vibration generated by the transducer 3.
  • a charging electrode 7 is disposed near the tip of the nozzle 1 to surround the top of the ink column 5. Accordingly, there exists an electrostatic capacitance between the ink column 5 and the charging electrode 7. If a voltage is applied to the charging electrode 7, electric charges are induced in the ink column 5.
  • an ink droplet 6 separated from the ink column 5 remains charged in proportion to the amplitude of the voltage applied to the charging electrode 7.
  • the charged ink droplet 6 flying toward a recording medium 12 passes between deflecting electrodes 9a and 9b, it is deflected by the electrostatic force acting thereon. If the droplet 6 is negatively charged and if the deflecting electrodes 9a and 9b are respectively connected with the positive pole of a high dc voltage source 10 and grounded, then the negatively charged droplet 6 is bent toward the deflecting electrode 9a.
  • the ink droplet 6 which is not charged is not deflected and flies straight toward a gutter 11.
  • the gutter 11 collects the uncharged ink droplets for the purpose of reuse.
  • the positively charged ink droplet 6 is bent toward the deflecting electrode 9b and collides with a detector 30.
  • the detector 30 is so located that the ink droplet charged by the signal voltage for phase detection or deflection sensitivity detection may hit it.
  • the relationship in phase between the generation of the ink droplets or deflection sensitivity and the information recording signal voltage is checked on the basis of the output of the detector 30.
  • An information recording signal generator 13, an annex signal generator 14 and a compensation signal generator 19 generate respectively an information recording signal (d), an annex signal (b) for deflection sensitivity detecting and phase detecting etc. and a compensation signal (c) (diagrams (d), (b) and (c) in FIG.
  • the annex signal (b) and the compensation signal (c) are synthesized by a first synthesizing circuit 20.
  • the output of the first synthesizing circuit 20 and the information recording signal (d) is synthesized by a second synthesizing circuit 21 and the output of the second synthesizer 21 is applied through an inverting amplifier 16 as a signal (a) to the charging electrode 7.
  • the relationships of the timing of generation of ink droplets to the signal voltages (a), (b), (c) and (d) are as shown in FIG. 2. In FIG.
  • the ink droplets 6a 1 , 6a 2 , 6a 3 , 6a 4 , Vietnamese are for information recording, the droplets 6a 2 and 6a 4 being compensated in charging according to the compensation signal.
  • the droplets 6b 1 and 6b 2 are droplets used for the purpose excepting information recording and charged by annex signals for deflection sensitivity detecting and phase detecting etc. and the droplets 6c 1 and 6c 2 are not charged and are collected by the gutter 11.
  • FIG. 3 shows in further detail the electric circuit shown in FIG. 2, as an example where the annex signal is used for deflection sensitivity detecting.
  • the information recording signal generator 13 consists of a flip-flop FF 1 and a picture signal voltage generator 31 and the picture signal voltage generator 31 generates the information recording signal (d) on the basis of a data signal.
  • the information recording signal (d) is generated in timing with the Q output of the FF 1 actuated by the clock signal sent from the HF power source 2 via the Schmitt circuit 17.
  • the deflection sensitivity detecting (annex) signal generator 14 consists of flip-flops FF 2 and FF 3 and an AND gate 32.
  • the compensation signal generator 19 consists of flip-flops FF 4 and FF 5 and an AND gate 33.
  • the phase of the output of the AND gate 33 lags that of the output of the AND gate 32 by a single cycle.
  • the first synthesizer 20 is constituted of an operational amplifier 34, input resistors r 1 and r 2 and a feedback resistor r 3 .
  • the outputs (b)' and (c)' of the AND gates 32 and 33 are applied to the negative input terminal of the operational amplifier 34 through the resistors r 1 and r 2 .
  • the second synthesizer 21 is composed of an operational amplifier 35, resistors r 4 and r 5 and a feedback resistor r 6 .
  • the output of the operational amplifier 34 and the information recording signal (d) are applied to the negative input terminals of the operational amplifier 35 via the respective resistors r 4 and r 5 .
  • the positive input terminals of the operational amplifiers 34 and 35 are both grounded.
  • the output of the AND gate 32 is adjusted to a predetermined value through the resistor r 1 .
  • the level-adjusted output becomes the signal (b) and is sent through the operational amplifier 34, the resistor r 5 , the operational amplifier 35 and the amplifier 16 to the charging electrode 7 to charge the ink droplets 6b 1 and 6b 2 (see diagram (e) in FIG. 2).
  • the degrees of charging the ink droplets 6a 2 and 6a 4 which come respectively just after the ink droplets 6b 1 and 6b 2 and are charged in accordance with the information recording signal (d), are affected by the charges on the ink droplets 6b 1 and 6b 2 .
  • the compensation signal is delivered from the AND gate 33 in parallel with the deflection sensitivity detecting signal (or annex signal).
  • the output of the AND gate becomes a compensation signal adjusted to have a predetermined level suitable for cancelling the influence, through the resistor r 2 .
  • the level-adjusted output serves as the compensation signal (c) and is applied through the operational amplifier 34 and the resistor r 5 to the operational amplifier 35.
  • the information recording signal (d) is also applied through the resistor r 4 to the operational amplifier 35.
  • the information recording signal (d), the droplet deflection sensitivity detecting signal (b) (or annex signal) and the compensation signal (c) respectively have positive, negative and negative polarities with respect to the input terminal of the operational amplifier 35.
  • FIG. 4 shows in block diagram another embodiment of this invention, in which the outputs of the generators 13, 14 and 19 are synthesized by a synthesizer 23.
  • FIG. 5 shows in further detail the circuit shown in FIG. 4. The difference of FIG. 3 from FIG. 5 are as follows.
  • the AND gates 32 and 33 are replaced by NAND gates 36 and 37; clamping circuit including capacitors C 1 and C 2 and diodes D 1 and D 2 is incorporated so as to make the poralities of the deflection sensitivity detecting signal (b) (or annex signal) and the compensation signal (c) opposite to that of the information recording signal (d); and the first synthesizer 20 is omitted, with the resistors r 1 , r 2 and r 3 connected with the negative input terminal of the operational amplifier 35. Accordingly, unless either of the deflection sensitivity detecting signal and the compensation signal is not generated, the NAND gates 36 and 37 deliver outputs of high level so that the capacitors C 1 and C 2 are charged as indicated in FIG. 5.
  • the NAND gates deliver outputs of low level so that the voltages of negative polarity at the capacitors C 1 and C 2 are applied through the resistors r 1 and r 2 to the operational amplifier 35.
  • the information recording signal (d) is of negative polarity
  • those inverting means are not necessary and AND gates can be used in that case as in FIG. 3.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Fax Reproducing Arrangements (AREA)
US05/683,277 1975-05-09 1976-05-05 Ink jet printer Expired - Lifetime US4080606A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP50054450A JPS51131222A (en) 1975-05-09 1975-05-09 Ink jet recording system
JA50-54450 1975-05-09

Publications (1)

Publication Number Publication Date
US4080606A true US4080606A (en) 1978-03-21

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Application Number Title Priority Date Filing Date
US05/683,277 Expired - Lifetime US4080606A (en) 1975-05-09 1976-05-05 Ink jet printer

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US (1) US4080606A (enrdf_load_stackoverflow)
JP (1) JPS51131222A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328505A (en) * 1979-09-03 1982-05-04 Ricoh Company, Ltd. Ink jet printing apparatus
US4490729A (en) * 1982-09-15 1984-12-25 The Mead Corporation Ink jet printer
US5408255A (en) * 1992-11-16 1995-04-18 Videojet Systems International, Inc. Method and apparatus for on line phasing of multi-nozzle ink jet printheads

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631511A (en) * 1970-05-08 1971-12-28 Dick Co Ab Drop charge compensated ink drop video printer
US3681778A (en) * 1971-05-03 1972-08-01 Dick Co Ab Phasing of ink drop charging
US3789422A (en) * 1972-09-21 1974-01-29 Ibm Ink drop coupling capacitance compensation
US3828354A (en) * 1973-09-27 1974-08-06 Ibm Ink drop charge compensation method and apparatus for ink drop printer
US3833910A (en) * 1973-06-18 1974-09-03 Ibm Ink drop printer charge compensation
US3981019A (en) * 1973-09-26 1976-09-14 Nippon Telegraph And Telephone Public Corporation Charging signal supply circuit for ink jet system printer
US3984843A (en) * 1974-07-01 1976-10-05 International Business Machines Corporation Recording apparatus having a semiconductor charge electrode

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5230212B2 (enrdf_load_stackoverflow) * 1973-01-17 1977-08-06
JPS5225286A (en) * 1975-08-21 1977-02-25 Nippon Telegr & Teleph Corp <Ntt> Laying method and device for subaqueous cable

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631511A (en) * 1970-05-08 1971-12-28 Dick Co Ab Drop charge compensated ink drop video printer
US3681778A (en) * 1971-05-03 1972-08-01 Dick Co Ab Phasing of ink drop charging
US3789422A (en) * 1972-09-21 1974-01-29 Ibm Ink drop coupling capacitance compensation
US3833910A (en) * 1973-06-18 1974-09-03 Ibm Ink drop printer charge compensation
US3981019A (en) * 1973-09-26 1976-09-14 Nippon Telegraph And Telephone Public Corporation Charging signal supply circuit for ink jet system printer
US3828354A (en) * 1973-09-27 1974-08-06 Ibm Ink drop charge compensation method and apparatus for ink drop printer
US3984843A (en) * 1974-07-01 1976-10-05 International Business Machines Corporation Recording apparatus having a semiconductor charge electrode

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Chai, H. D. et al., Charge-Coupled Device for Ink Jet Compensation, IBM Tech. Discl. Bulletin, May 1974, vol. 16, No. 12, pp. 3868-3869. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328505A (en) * 1979-09-03 1982-05-04 Ricoh Company, Ltd. Ink jet printing apparatus
US4490729A (en) * 1982-09-15 1984-12-25 The Mead Corporation Ink jet printer
US5408255A (en) * 1992-11-16 1995-04-18 Videojet Systems International, Inc. Method and apparatus for on line phasing of multi-nozzle ink jet printheads

Also Published As

Publication number Publication date
JPS51131222A (en) 1976-11-15
JPS5634909B2 (enrdf_load_stackoverflow) 1981-08-13

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